Please make sure to update to WPML 4.3.6 and check our list of Known Issues before reporting
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This thread is resolved. Here is a description of the problem and solution.
Problem: icl_string_pages to big problem Solution: You can truncate this table and it will not fill up any more (since WPML 4.3.0). Relevant Documentation: https://wpml.org/?p=4788133#comment-2687365