Your link is listening to the tail of the link. And visa versa.
Try CTCSS on your system link if the repeater is toned and passes or generates the tone when it’s cos is active.
You will need to think of what is happening logicly to remody.
BTW, I have to chastise anyone I see doing this. So don’t take this personal but it’s really bad form.
Causes extra squelch tails
Audio is not as good as Allstar is
hang time problems
it’s half duplex
hear beeps and IDs from other nodes
ping-pong problems
All of this gives AllStar a bad first impression.
Please consider doing Allstar the right way. Put the node at the repeater. It interfaces well to the repeater itself of to a controller port. You’ll be much happier.