RSS and View posts since last visit

I usually use the View posts since last visit page to keep up to date with this forum. However I recently subscribed to the RSS feed (as a livemark in Firefox.) I don't always check the RSS feed and I've noticed that if a post appears in the RSS feed it will not then appear on the View posts since last visit page.

Is it possible to make the two independent?

Thank you for report. I'll try to fix this bug.