The exact solution for 38.59 in base 15 is the repeating decimal 28.8cb3b3b3b3b3b3b3..., which means the given solution 28.8cb3b3b3b3b42d4a contains some "junk digits" at the end; it's not really fair to ask for those junk digits as opposed to any others. Also, it looks like trailing zeros are supposed to be removed, but some of the base 2 solutions contain a trailing zero.
You are correct. Thanks for the comment. Fixed the errors you detected as well as a few others. Should be good now.
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