I’m with the others here, as long as they are from the same day, and reasonably close geographically (I’m not really interested in a debate on what is ‘reasonable’) then leave them.
When almost all users of the site ‘technically’ break the rules, it tells me more that there is an issue with the rule than anything else.
If anything the ‘rule’ creates more problems (proportional over-representation of the species you are documenting in the dataset, needlessly flooding the needs id pool in particular in plants which already suffer from low review rates etc), there is a reason most every other similar site does not use this approach.
Different species for sure have to be in separate records, but I dont think you have those.