Priority Icons in JIRA appearing different sizes, anyone else with this issue?

[Elizabeth Bedwell]

We have custom icons for the Priority field in JIRA, they are appearing okay in all areas of JIRA across multiple projects. Until the board Report section, this is how it appears on the Sprint Report:

Issue on Sprint Report.png

This is how it appears on the Release Burndown:

Issue on Release Burndown.png

I cannot find any reason for this, other than perhaps a normal bug. Has anyone else using custom priority icons come across anything like this and have any suggestions as how to fix it? As it makes the Release Burndown a little unusable like this.

Thank you in advance,

Liz

Issue on Release Burndown.png

Issue on Sprint Report.png

[Elizabeth Bedwell]

After some digging it appears to be the same size as it's appearing in the screenshot above. I'm guessing this means that the icons need to be uploaded at a smaller size?

[Olivier Orlow]

What is the size of the icon that you uploaded?