[Help] Sig campaign signature oddness

Hi,

There's been some odd behavior with the Junior sig in the bounty campaign (https://bitcointalk.org/index.php?topic=2141278). Its not complicated, its not long, its not multiline and doesn't use any special formatting aside from 6 ascii block characters. The sig looks like this:

█▓▒ JUNIOR ▒▓█ ZILLA The ICO Marketplace Token Crowdsale | Ye Thread

Code:

[center][b][color=navy]█▓▒ JUNIOR ▒▓█ [/color] [color=red] ZILLA[/color] The ICO Marketplace [url=zla.io]Token Crowdsale[/url] | [url=https://bitcointalk.org/index.php?topic=2140007]Ye Thread[/url][/b][/center]

There's one member who can't seem to put this into his signature correctly (It cuts off after https://). There are, however, members who have added the signature successfully.

Any help figuring out where we went wrong? The rest of the sigs are designed this way as well; we want to avoid further problems. Thanks!