Ok, that's good. (Well, not good, but at least it is consistently related to number fields) I'm not sure I can work out how to replicate it though. The fact it comes out in both the UI display and the exports, assuming by "export" you mean you are using a spreadsheet or word-processing download, implies that there is some form of character replacement going on. Jira itself doesn't do that unless someone has been messing with the display templates, so the suspect becomes a Tomcat setting. First thing to check is the "modified files" section in your system information page - does that have anything that might be implicated? A file name referring to custom fields or templates? The next test I'd try is to download the raw "xml view" of an affected issue - does that contain #5 5 as well?
Ok, there's some form of substitution happening here, it's either an obscure Tomcat thing, or someone has scripted something, or they've hacked a template. I'm afraid you probably need to go back to the "modified files" and go over *anything* that has been changed. Also, are you using any language with odd characters?
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