Ambiguous chevron styles in an expander

I've begun to notice that a lot of apps have opted to use a right arrow chevron on the right edge of the header.

However, I am used to seeing it to indicate that it will transition to a different page. This is common in mobile applications as well as some desktop applications like firefox overflow menu's.

From my personal observation and experience, a right arrow chevron, if used as an expander, should not be on the right side. It can be either on the left of the header or a different icon like a down arrow chevron.

For example, I find the following pictures quite misleading, and I believe in their current positions, they should be down arrow chevrons instead.

Am I correct to say this? I realize there isn't a black or white solution, but I'm leaning towards my reasoning. But because a lot of apps made specifically for UI designs do in fact follow this pattern makes me uncertain.