If possible could you post both your script code (properly formatted, see Wiki - how to post code on this forum. ) and some screenshots showing how your bindings and views are configured. (redacting any sensitive information as needed)
In general, anything that is controlling what screen your session is on, navigation in a session, or selection of items in a session should NOT be a gateway memory tag. They are server wide¹ so if multiple sessions are running they will all use the same tag, and you will have one session navigating/interfering with the others.
For your use case, the value should likely be kept in a view custom property.
1 - Vision has per session tags but that's not what you are using