Trending @Capgemini; LWD date revised at Infosys with no prior communication.

I was on my ML when I resigned ( 6days before my ML completion ) and my exit dashboard showed 26 March as my LWD which is what conveyed to my next company and selected 28 march as a joining date. So as I saw 26th is my LWD I submitted my id and assets on the same day. And joined new company on 28th after a month infosys shared me my relieving letter and gave 4th April as my LWD (reason as i was 6 days were pending to complete my ML) they added those days to my notice period. But already i had joined new company and now my service history is showing overlap of 6days . I already asked infosys to change it but no lucky and every company questions me about this overlap. Please suggest on this.

Luckily i had taken screenshot of my exit dashboard that shows 26 march as my LWD but they revised it later with no communication