Emails sent from comcast.net are being received from comcast.com

My mother has been having trouble sending emails lately.

 

Her Comcast email is @comcast.net

 

When her emails are read by the recipient they apprear to be from  @comcast.com

 

I believe this is why some emails are not being received.

 

Is this a problem?

 

Email header from an email sent by her to me.

 

X-Atlas-Received: from 10.218.249.13 by atlas202.free.mail.ne1.yahoo.com with http; Sat, 16 May 2020 20:32:18 +0000
X-Apparently-To:@yahoo.com; Sat, 16 May 2020 20:32:18 +0000
Return-Path: <@comcast.com>
Authentication-Results: mta4041.mail.ne1.yahoo.com; 
 dkim=pass (ok) header.i=@comcastmailservice.net header.s=20180828_2048;
 spf=softfail smtp.mailfrom=@comcast.com;
 dmarc=fail(p=none sp=none dis=none) header.from=comcast.com;
Received-SPF: softfail (transitioning domain of comcast.com does not designate 69.252.207.37 as permitted sender)