The species count could change if some of the observations had been identified to species (or changed from one species to another, or a species ID withdrawn) in those five minutes. I don’t know why the observation number would change.
not possible to answer your situation here without some screenshots of what you’re seeing, as there are multiple different reasons depending on where you’re looking
No, I didn´t. Today I locked in iNaturalist the normal way, had the impression of “wrong” numbers, and looked for myself with the use of my personal nickname-petzenbeer-. And the numbers differed. I have experiented this phenomenom a lot of times in the past.
You looked at your profile, saw how many observations you had, then searched for “observations by (you)” and got a different number? Because that could be a matter not ticking off the “verifiable” filter, which would subtract casual observations in the second number