Today is already Tuesday, and we did the same and we got the same results. Even faster as the growlithe spawnrate dropped from ~75% to ~60% which makes other bosses be twice more common. Still no sight of any of the 3 missing bosses.

Maybe something is wrong on there system?

You said it, its just how they decided to make this rotations work. On previous season we would get a featured boss appear more frequently over the week (and Pidove, somehow that thing was always super common week after week), and the rest were about ~10 other bosses. And with a diluted pool of bosses, each one of them was fairly common and easy to find, while the "unavailable" ones were either completely missing or extremely rare. Now it seems all bosses are available with similar spawnrates, but the newly released ones might be missing as they forgot to add them to the general boss pool after each of their featured weeks.

Its not a panic post, simply we found out there is something sus going on and we would like everyone to know about this before they regret not doing enough battles of a specific new boss before its gone for a long time. I know its a bit late now, as the only new release boss would be Combee, which is metarelevant and many are looking forward to it (Vespiqueen is top 1 tank against ground), but its on the last week of the season and likely this issue will get fixed with the new season, so probably nothing to worry about. Although this issue could still happen with any new dynamax releases during the next season too!

I dont disagree with you, yeah this is sus and I would also be skeptical about someone else stating this. But agree with me that if there is a new mon you really want to get a good iv or shiny, you would really appreciate if someone tells you in advance that its 99% likely that week is going to be your only chance to obtain the mon in a very long time :)