I have same issue which is not resolve yet "but" I do notice this only happen if the PC have visited two CCTV Website with same site id. e.g 100-001 and same password e.g. 1234.
If the PC never visit more than one site with same site id, it is ok. That show why you can use it on other PC.
Question is: How to get rid of old setting that have kept the last visit.
I am still searching.