Yes, the explanation you are providing, does not make any sense.. sorry...The only thing that should happen if you don't get the next shot is that the protection could wear off and you could get COVID, but there shouldn't be an actual bad reaction to the shot. I got my booster after 9 months with no ill effects.
Are you in a different country? I looked at your profile and it says California but if you aren't in the US it might be a different brand of vaccine, or the doctors might be different, idk. But none of the US vaccines are approved for 3-month boosters.
It does sound as if you are from a different country.
What we are asking is: how is it that you got 6 Covid shots? We do not understand that.