Problem loading data from all indexes in visualizations

We are keeping in elastic last 30 days of our traffic. I have notices problem with loading those on Visualisations. When using only Discover all data are correctly loaded, but when trying to Visualise those data charts are likely to cut off somewhere in the middle. I'm attaching screenshots so you could understand what I mean.

There are no errors or timeouts in kibana/elastic logs.

Inside indeces we have one conflicting field, but Visualisation is made of other non-conflicting field.

You're sure there is data in the fields for the documents in second graph?

@warkolm You are right! Thanks. During upgrade of kibana we changed mapping and added for every string field also it's raw, not_analyzed version. We did it exaclty on 19 Aug. Sorry for the trouble.