如何防止粘贴到多个列？

I am quite new to VBA, and I have encountered an odd issue with the following code snippet. My goal is to insert rows when a user pastes data manually into a table. The user copies a portion of the table manually (let's say column A1 through C25 -- leaving cloumns D and E untouched), and when pasting it manually into A26, the rows are inserted. This way, the table expands in order to properly fit the data (because there is more content under the table).I am quite new to VBA, and I have encountered a