All wrting strokes must be "stacked", that is placed in comparison to each other. Depending upon other "strokes" or letter configurations in the writing sample, it could suggest a person who is careless, or may be going through a temporary or even permanent period of foregetfulness. An experienced analyst does NOT jump to conclusion, but weighs each stroke in a writing sample, calculating the how commonly, frequently or infrequently the stroke occurs and in the context of other strokes.

Handwriting analysis is a science (empirical). The more detail oriented the analyst, the more accurate.