It looks like the character creation prompt accepts height numbers (like 5.75) and option numbers (like 2), but appears to favor height numbers over option numbers. It is an interesting kind of feature bug, because being able to input 5.75 is delightful and useful, but having both options makes round-number inputs ambiguous. The prompt format is:
Choose your character's height in feet.
1. 5
2. 5.25
3. 5.5
4. 5.75
5. 6
6. 6.25
7. 6.5
Given that format, I would assume that round number responses (1, 2, 3, 4, 5, 6, 7) would result in the selected heights while decimal responses (5.0, 5.25, 5.5, 5.75, 6.0, 6.25, 6.5) would result in the desired heights. However, in this case using 5 appears to result in a five-foot height rather than six-foot. Consider changing up the prompt, reordering the response interpretation priority, or removing one of the input methods.