It seems that by default after generating the report, Testiny arranges defects in ascending order by their ID in Linear, which is a significant issue.
For example, on the first screenshot, a certain test case related to image attachment is shown along with two corresponding defects. On the second screenshot, after the report is generated, they are placed in a completely different case related to search.
The expected result is that defects should be placed based on the test cases I assigned them to in Testiny, not according to their ID in Linear.