Edited photographs looks different in different display

[mayukh]

I have using affinity for a few months now. 

I ensure to calibrate my laptop using Spyder 5 Pro every week. 

 

After completion of my workflow and before exporting files to TIFF format, i select sRGB as the ICC profile.

But my woes start when i transfer the files to my iphone 5s for uploading to Instagram. I see that the photographs look dull and lack the exposure/ highlights etc i have edited in affinity. 

 

Surprisingly, the feed of other people in Instagram when viewed from same phone, looks absolutely normal.

I would like to know where am i going wrong? 

thanks in advance.