roopaw, I had a somewhat similar experience with Hertz recently, when booking a Camaro for 3 weeks from SFO on July 9.
The rate for the three weeks without logging in was USD1,965 all inclusive (rate 2) and when I logged in and applied the QFF CDP, the rate was approx. USD1,500 with a 10% discount - great, I thought, until I realised that it didn't appear to include LDW or SLI insurance, despite my profile requiring both in the US.
A check of other cars at SFO and both the Camaro at different locations (LAS, SEA, etc), including LAX, which had almost identical pricing for all other cars except the Camaro, showed that when not logged in, rate 2 for all cars was a packaged or all inclusive rate and for all cars including the Camaro at SFO and when logged in and QFF CDP applied, the rate for all other cars/locations except the Camaro at SFO was the packaged rate less 10%.
Given this anomally, I called Hertz and the rep I spoke to initially said LDW and SLI was included. After I advised that it was not shown in my booking, she checked again and said it was no cost. I explained that all the other cars at SFO definitely had insurance shown as included, so she checked and confirmed that there appeared to be a problem with the Camaro at SFO! Great! I was told that they would need to contact the US and get back to me. A week later I'd heard nothing and my booking hadn't changed, so I called Hertz again. The first Hertz I spoke to wasn't there, so the person I spoke to told me again that the insurance was included! I explained the situation and she said she would look into and get back to me the same day or her superviosr would the following day (she was not going to tbe there). Again I didn't hear anything and three days later, I called again and asked to speak to either of the two people I'd spoken to, or their superviosrs. The person I spoke to was reluctant to transfer me, so I eventually had to say that it was a long and involved issue (which it was) and I didn't want to expalin it to a third person! After that, he transferred me to a supervisor and she advised that there was a note in my booking saying that the US had been contacted and the LDW was between approx. USD15 and 35 per day. I advised that was not good enough - the exact amount of the total, including LDW and SLI needed to be included in the quote/booking, as per my profile and, as there appeared to be a problem with this car at SFO only, it needed to be fixed. She eventually agreed to contact the US again and arrange for it to be fixed. Thankfully, she gave me her direct phone number and advised she would keep me informed. After I got off the phone to her, it twigged what the problem was - for some unexplained reason, for that car at SFO only, the QFF 10% discount rate was being applied to the unpackaged base rate, rather than the packaged rate, as it should have (I discovered this doing a search of cars via the Qantas website, which are all quoted on the base rate, so they appear cheaper, but once you add insurance, are significantly more expensive than the packaged rate). I rang the Hertz rep back and advised that's what I thought was happening - she said she would advise the US. She did keep me informed and the website was fixed a couple of days later, but my booking was not! My booking ended up being USD2,100 (incl. LDW & SLI, but not at the packaged rate), even a day after the website was fixed and I received an e-mail from another person at Hertz to say it had been fixed. My booking remained at the incorrect amount for several days, so I replied to the e-mail I'd received severla days later, saying that my booking was still not fixed and I getting tired of following it up. It turned out my booking had been fixed overnight and I hadn't checked! End result was USD1,670 packaged rate, all inclusive (Note: this is a 15% discount on the packaged rate, which I discovered RACV provide on this car).
I checked Florida International airport for 2 days from July 9 and came up with similar rates to you and it appears a similar thing is happening - the QFF discount is being applied to the unpackaged base rate, rather than the packaged rate, and once insurance is added, the cost ends up being higher.
Apologies if this reply is long! In summary, Hertz appear to have some IT glitches and it appears that either the QFF 10% discount doesn't apply to the packaged rate in Florida (unlike all the other places in the US I've checked), or they have another system glitch!