Zuu opened the ticket and wrote:

The order of signs with equal names are not preserved when the sign list is resorted. This is easiest spotted by using multiple companies to place equally named signs.

When one click on the toolbar button to build a new sign, then the sign list is re-built and the previous order of the signs is lost. Later when a name is given it will be added to the bottom of signs with the same name.

I've tested this in r20007 and r19935. It is possible that also other Gui lists has the same problem but I have not investigated that.

Reported version: trunk
Operating system: All

This issue was imported from FlySpray: https://bugs.openttd.org/task/3893