Coding assist for dot (.) is incorrect sometimes

Sometimes, when I type in code in QtCreator, it mistakenly converts dot (.) to arrow (->). For example, it sometimes happens when I type floating point constants, and as a result I get something like this:

sample_rate_multiplier(1->0f),

If I try to fix the code by erasing -> and typing . instead, QtCreator gives a drop-down list of various nonsensical symbols, like macros, keywords and whatnot (see the screenshot).