Apologies I'm not an expert in TeX, but hopefully the steps below explain the issue.

1. Open the equation editor in the text editor.
2. Type 0<x<1
3. Note how the equation looks in the equation preview
4. Hit Save equation
5. Note how the result is (0 i.e. different to what was displayed in preview.

Interestingly x<0<1 seems to work ok in the editor.

Also note that typing 0<x<1 directly into the editor with $$ before and after the equation works correctly.