My traffic acquisition report shows that people are finding my website through organic.

But when I check user acquisition report it shows a big gap in traffic after May15:

It shows 20+ organic traffic on the last day but it never records it.

Any idea what happened?

I made sure that the tracking codes are on the site. Could it be because I have both GA4 and GTM codes running on the site that one of the tracking codes is stopping the data from being recorded?