One question I didn't ask in my previous post was whether you are using the Full Site (Desktop) or Mobile view of JOF. I run in Full Site (Desktop) view on all my Windows and iOS devices. The Tech replied to my email and said it looked to him that you were using the Mobile view of JOF. In Mobile view, signatures are not displayed and, if present, they only appear in the Full Site (Desktop) view.
In a nutshell, the Full Site (Desktop) view is the full featured version of the JOF Forums. The Mobile view is offered to help users who have slow Internet speeds and/or their ISP's data plan is limited. To accomplish this, the size webpages (view) in the Full Site (Desktop) version were reduced so that a smaller amount of data is sent over the Internet which made transmissions faster and made more efficient use of the user's data plan.
To make this happen, some of the features of the Full Site (Desktop) view were removed or modified.
The Mobile view has been available for a number of years now. However, today's ISP's offer data plans and Internet speeds that makes Mobile view unnecessary for just about everyone. I suggest anyone currently using Mobile view to, at least, try the Full Site (Desktop) view. I think You'll like the change.