The Brother ScanNCut mats have an adhesive application already applied to the surface allowing fabrics and papers to be securely held in place while using the machine.
Although the adhesive is low tack it attracts every loose fiber and hair to its surface making it difficult to have a clean cut without causing woven fabrics to fray and loose threads from migrating between surfaces.
When removing woven conductive fabrics from the cutting mat be careful with the fabric edges. Each stray thread is a potential short circuit.
This is particularly problematic when using conductive materials as the loose eTextile fibers can stick to other surfaces resulting in your final design having a short circuit.