If I am not mistaken (I do not use it) VARAC is typically rather narrow at 500Hz so even with tight narrow filters a nearby VARAC will certainly result in QRM.
I think it worth noting though that most but certainly not all Winlink use of VARA on HF can with decent signal paths be quite wide at nearly 3k Hz and if you check as Julian suggested you will likely find a bunch jammed around both the NET105 and the NET40 freqs... and at upwards of 3k Hz wide it can be nearly impossible to avoid the Winlink QRM when several are active simultaneously on either side of the ax25 freqs.
73 de Rich WA3WLH
