This kind of error arises from mistaken thinking about orthography.
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"If the word starts with [s], then why does it have a <t> in front of it?"
Also? This doesn't just happen with bound base elements! That is just total nonsense. A replaceable <e> can happen on free or bound bases, as well as on suffixes, and so can a potential <e>.
A kiddo's grown-ups are responsible for loving them, and that love should keep us all together, on the same page, working for the child's best interest.
The suffixing patterns are flexible, because their most important job is marking the morphological family that the word belongs to.