One User Per Sheet
If a second user doesn’t have the add-on installed and tries making changes to the formulas, it will break a lot of things. It’s best if the owner of the sheet makes all the changes to the formulas on the sheet. If you want to have collaborators make edits to the formulas on a sheet, they both must have the add-on installed.
Don’t Position Queries on Top of Each Other
Queries get populated below the formula in the Google Sheet up to the number of rows specified in the row limits. When the data populates the sheet it will over write anything below it. It's best to either use a separate sheet or a separate column (with nothing under it) when inserting multiple queries.