Misnest

dUTIL can assist in the location of certain types of logic errors, primarily those involving misnesting of logical constructs or missing symbols.

Source: wiktionary

In this case, the problem is easily solved by the same parentheses that ought to be used to prevent misnesting of arithmetic operations.

Source: wiktionary

Are there tags in places where they're not allowed? Have you tried to misnest tags anywhere ?

Source: wiktionary

Improper use can cause misnesting, operator precedence problems, duplication of side effects, and other problems.

Source: wiktionary