Plugin ToC duplicates the right column Contents

Logseq 0.10.9 plugin ToC (table of contents) duplicates the right column contents.
When I select the ToC icon, the right column appears with the TOCs, however it seems that selecting the ToC icon not only opens the right column, rather also adds a list of content. Therefore when I close the right column table of contents and reopen the ToC by selecting the ToC icon, a third table of contents is added.
This cycle must repeat forever? However I only need 1 list of table of contents.
I can quickly select the delete icon, however is there a way to stop this in the first place?