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sam. Reading over the intial Q, looks like Anvar can see the Broadcasting SSIDs in what ever manager he is using.

If you get get all the security off as suggested by GT.

I assume you are using the webgui. Make sure and check over the /ap_sec_ap-client-security.shtml page.
Firstly during the testing. Stop using the multiple SSID, Higlight one of the SSID and untick its associated to the radio. Press 'Apply' Then see if you can connect. Then test the other SSID in the same manner.

Then with multiple SSID broadcasting you can also force infrastructure devices to associate with a single SSID. ( Bottom of the page) If you set to one of the SSID then try connecting to that. See if that works.

If you are still getting problems at that point, I would suggest starting fresh and rebuild the device from scratch but without any security and check your connectivity. It may be quicker and less stressful in the long term. You dont find out what caused the problem but if you get it built correctly on a second build be happy. ( You've learned how to build an AP ) ;-)