Strange display of common characters

Today I encountered a strange bug in redash.
In my query I made the following concat: “concat(sum(u.gehaald),’/’,count(u.user_id))”.

Usually it generates the expected " 3/3", however today I saw a strange display:

When I queried without the concat I saw 3 columns with 3, / and 3. So separately it displays the correct characters.

What is wrong with redash?


any news on this strange dipslay of common characters?
I tried to change the separator to ‘_’ and ‘-’, however it returns the same display with the only difference that 2f is is replace by another combination e.g. 5f