overlap between contigs

[wawjcwxy]

Hi All,

recently I used Falcon to assembly a diploid insect using Pacbio long reads. After the assembly was finish, I run blast self to self, and I fund quite a lot overlap between different contigs. usually those overlaps locate at the end of contigs, with length > 50kb and identity > 99%. (the picture is as follow) Are those overlap due to the Pacbio reads or the algorithm of Falcon. Thank you in advance!

Best regards,
Wenbo