Hello,
this happens to me now a few times on different servers in different situations.
First TS3-Bot Server (Map Field):
I was in MRSL and got out of the borders near the comm center and couldn't move back. After my vehicle exploded and I died I stood there but on the minimap I was in the AGT. Also I was able to buy sth. The suicide button had no effect so I suicided myself with C4 and then I was back to normal.
Second Renegade X Server (Map Lakeside):
I was in Chinook and tried to go over the place where is normaly the comm center in LakeSide without Flying. After I spied a Bot-Havoc I went on the chain-guns of the Chinook. After I switched there I was in 3rd Person Mode and couldn't go to the 1st-Person Mode. Even switching to the pilotseat it didn't work. After I got out the vehicle and got later in it, it was normal. After I rushed to the WF with the chinook and died, I had again the "Ghost"-Bug. I was in their base dead, and on the minimap I was in HoN and could buy sth. etc.
Hope that helps. If not, I try to record a video from it.