Not everyone has the same relationship between their MLSS and the strength of their anaerobic system.
So if the plan says “do these anaerobic intervals at 150% of FTP” for you that could be too much, could be too little.
You could bump up the intensity using the little plus sign, but IIRC that means everything bumps up, not just the interval. So if the work interval is too easy but the rest interval is just fine, use the workout creator to make your own version of the workout.
This advice is of course assuming that your FTP-based / zone 4 interval sessions are appropriately challenging (and not also too easy).
certainly nothing to worry about.
Also i just realized you said “anaerobic” in the title and then “vo2max” in the post, which i assume to mean intense (above MLSS) but still aerobic.
Are you finding both types of workouts too easy? Just one? Same general advice in the short term (bump it up) but the physiology driving each one would be a bit different.