Stitching does not seem right

[Anthissa]

I just embroidered a red shirt with a black lettering and in the lettering I am seeing white. I am running a xts. What would be the cause of this? I am a really new to the embroidery world.

[Knehmer]

Are you using white bobbin thread? You need to clean the bobbin area out.

[Anthissa]

I am using white bobbin thread. Okay that makes sense, I did the shirt last night after a full day of running the machine, this morning I cleaned everything out and now I am not seeing it. Thank you