Yer, there certainly has been some selling over the past few months but as you point out its hard to understand what is driving this.
You get good insights in the the activity of IT Services companies on Glass Door.
RXP - talk of growth and sales - https://www.glassdoor.com.au/Reviews/RXP-Services-Reviews-E758221.htm
DWS - a little pessimistic re. growth and operations - https://www.glassdoor.com.au/Reviews/DWS-Reviews-E142493.htm
SMS - quite critical of management - https://www.glassdoor.com.au/Reviews/SMS-Management-and-Technology-Reviews-E141582.htm
DTL - positive in terms of culture and growth - https://www.glassdoor.com.au/Reviews/Data-3-Reviews-E238175.htm
MLB - sounds like chaos, highly critical - https://www.glassdoor.com.au/Reviews/Melbourne-IT-Inc-Reviews-E235612.htm
CGL - high praise - https://www.glassdoor.com.au/Reviews/Citadel-Reviews-E14937.htm
EPD - mixed reviews - https://www.glassdoor.com.au/Reviews/Empired-Reviews-E799525.htm
Overall, RXP, DTL and CGL are most highly regarded.