Vendors and tower issue

I heard about issue with Vendor join but trading center doesnt show anything which happened to me (first screen shot), then another vendor joined and i got notification of old and new vendor twice and i have 2 of each vendors and trading center show their items (screen shot 2)

1 and 3 are same and 2 and 4 are same but another vendor
when i clicked my towers to check the progress of building it i got the following

Thank you for your support and help

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