same room and somehow we all finish in like 10 minutes of each other every time??

this is gonna sound silly but its been bothering me. M37 / F35, ls for about 14 months, we play maybe once a month with one of 3 regular couples. we do same room mostly. and i swear every single time, all four of us climax within like a 10 minute window of each other and then it just... ends. like everyone is done and there's the awkward "is everyone done" moment and then we're all just lying there looking at the ceiling. then we get up, get water, get dressed. i thought it was a coincidence the first time. by the 5th or 6th session i started noticing the pattern. its like once one person finishes the energy in the room shifts and everyone follows within minutes. nobody is faking, but somehow the room sync's up. with our couple A this is fine bc we're all chill afterwards. with couple B it's awkward bc there's this weird "now what" energy and we end the night earlier than anyone wanted. is this a known thing in same-room play? does separate-room solve it bc nobody knows what the other room is doing time-wise? has anyone figured out a way to stagger this so the session has more layers