Xtype ${KEY_CTRL+KEY_V} seems add a blank space at the beginning

What I did as below:
csvRead | test.csv
echo | ${!COL1}
store | ${!COL1} | !clipboard
XClick | xpath=//input
click | xpath=//search button
but when XType is done, it will get an extra blank space before ${!COL1} in the inputbox, so that search failed. and I am sure that there is no blank space csvfile or ${!COL1}.
Is there any suggestions, thank you.

echo | ${!clipboard}, it will output “no luck”