i am finalizing my rflink installation but i bumped on a weird stuff

so i did a 10;RTSCLEAN; to clean up my test
then i have added one by one my record and tested good comunication with blinds.
RTS Record: 0 Address: 41F781 RC: 0415
RTS Record: 1 Address: E2F6B1 RC: 0414
RTS Record: 2 Address: C466DB RC: 0416
RTS Record: 3 Address: 200933 RC: 0414
RTS Record: 4 Address: 90D906 RC: 0414
RTS Record: 5 Address: 5AC9BA RC: 0413
RTS Record: 6 Address: 9663F0 RC: 0413
RTS Record: 7 Address: B89C3B RC: 0413
RTS Record: 8 Address: 68B8A1 RC: 0413
RTS Record: 9 Address: 1BD7EE RC: 0414
but then i tried to add my 2 lasts one:
10;RTS;E7EB25;0412;010;PAIR; which give me an error 20;1B;CMD UNKNOWN;
what puzzle me a bit is that i also noticed that some of those address are already populated when i didnt do any pairing
RTS Record: 10 Address: 160E00 RC: 9E19
RTS Record: 11 Address: 5D1B91 RC: 0C7A
RTS Record: 12 Address: 4E1B91 RC: 0AF7
RTS Record: 13 Address: 751B91 RC: 0B44
RTS Record: 14 Address: 571B91 RC: 08C4
RTS Record: 15 Address: 000000 RC: 0000
did i miss something somewhere ?
thank you in advance
