If you are using base searches, you must return the fields required by all the panels on base search. If you do not return the fields on base search, then the panels will not work as expected. In you situation change your base search return fields, then your problem should be resolved. Please let me know if this doesn't work.
<search id="baseSearch1">
<query>
$control_token_visualizations$
|from datamodel:"Malware.Malware_Attacks"
|search $env_tok$ dest="*$hostname_tok$*"$avtype_tok$ vendor_product="$vendor_tok$" sourcetype!=carbonblack:defense:json
|fields vendor_product,dest
</query>
<earliest>$time_tok.earliest$</earliest>
<latest>$time_tok.latest$</latest>
</search>
If you want to know how to use base searches with a quick example, you can also refer to the below video.
https://www.youtube.com/watch?v=6s3jV6Tx6yg
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