1. Please make sure that the selected text has no extra spaces or formatting before copying the text. You can use the Select All feature to ensure that the selected text has no extra spaces or formatting.
2. When pasting text in WeChat, try to use the "Paste as Plain Text" option. In WeChat, you can press and hold the text box and select the "Paste as Plain Text" option. This will remove any formatting and extra spaces and paste the text as plain text.
None of the above methods can solve the problem. You can try using other text editors or applications to copy and paste text. For example, you can use Notepad or other text editors to copy and paste the text and copy it to WeChat.