Tanker Tacan HSI

Hey guys

I am building a mission and some of the tanker tacans show me the tacan symbology on the HSI and if I track another tanker the symbology doesnt display. I know how to input tankers into missions and usually have them working all the time however I am not understanding why sometimes it shows and other times not. Is it something I'm doing wrong?

In the attached images I am tracking Shell and Arco, Shell appears Arco does not. Same mission and I've deleted and re-added the tankers but same thing.

Thanks in advance for any help.

Issue solved.

Setting tacan to X saving mission then back to Y worked.