@KF2ZedHunterYes, it may be it, BUT..
On my very first post here, I also thought the Tech Level XP was the amount missing, but those print screens were from a CAREER session and someone said (correctly) that I wasn't supposed to get any Tech Level XP in these career sessions (which makes perfect sense) and then it was actually just a visual glitch that I got that Tech Level XP, bla bla bla..
BUT THEN..
I noticed the issue is still happening (as I mentioned on my last reply above) in actual F1 World events - and I have 'proof', which is the fact that sometimes when you complete an F1 World event, the screen shows your XP bar going over your current level and literally showing you leveled up - but then when you're back to the game menu, you find out you have NOT leveled up yet - which, as I said, proves that some amount of XP was NOT given properly - I'm not sure if that amount also happens to be the Tech Level XP, but it's clear that there IS an issue and some XP is NOT being given properly..
Right now, I finally reached level 50 on the Podium Pass and I'm on the current max Tech Level of 1400, but I hope this gets fixed for the next Podium Pass, of course.
=)