The camp ground should update their Access Points to better 2.4Ghz or 5ghz ones(Strongly encourage them to do so). Also they might not have the access points setup correctly. The could also be using a residential type router. The problem you are having is Co-Channel interference and some solutions are:
Physically relocate APs
Lower transmit power of the radio
Create a static channel plan
Move to using 5 GHz only, wherever possible
The two best ways for you would be to low transmit power or create a static channel plan. Lowering power can be done in the GL.iNet UI or LuCi.

Creating a static channel plan will be more involved and I believe it can be done in LuCi but more likely need to be done by SSH. You may want to try reposting on the OpenWrt forum

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