Companion star not in field

I am taking images of BL Boo and stacking 6 one minute images for each data point. When I make my sequence, everything is fine, but when I run the report it shows graphs for the variable star and check star but says it can not find the companion star in any of the images. I have tried this with three different companion stars now. Is this a v-photo glitch or have I done something wrong? I would attach one of the stacked photos, but the forum is not allowing me to. sorry.