Stain won't take on part of door
I stained a door today, but the stain isn't taking on two small sections of the door. This is the door on my half bathroom in my basement. This is a house built in 1950, so the basement ceiling is low. In order to find a door which would fit, my handyman bought a slab door, and cut it to fit. After he cut it the pre cut hole for the door knob was in the wrong place, so he cut out a new one and plugged the previous hole with a wood plug cut out of the discarded wood. It is this wood plug that won't take the stain. Does anyone have any suggestions for staining this small circular patch? I tried sanding it again but the stain still didn't take. Is there a product I can use which would make the patch take the stain?
I would appreciate any help.