HELP - toilet water in 2 toilets mysteriously low

I have two toilets on opposite sides of a wall (one in master bedroom, one in main house bathroom). I also had a slow draining tub in the main bathroom. I used a wet/dry vac on the drain in the tub - both sucking and blowing to get any hair clogs out.

That solved the tub's slow drain. But now ever since I did that the two toilets have very low water levels and they "gurgle" when you flush them.

I thought maybe the plumping vent pipe on room was clogged. I heard squirrels can clog it with acorns. I went on room and stuck an 11' pole down, but didn't feel anything. Obviously would need something longer or run water down it to more fully test it.

Do you guys think it's the plumbing vent pipe clogged or was it the sucking/blowing action of the wet/dry vac that perhaps screwed up the pressure or maybe even sucked in material that was partially clogging the vent pipe - causing a worst clog.

trying to avoid calling the plumber if I can. Both toilets work, but taking a dump with little water requires cleaning the bowl which is a PITA.

p.s. the ballasts inside each toilet is already set so the water level is at its maximum height inside the toilet tank.

p.s.s. Could sucking/blowing have messed up the wax seals on the toilets? Doubt the wet/dry vac is that strong though.