Field names in email rather than data - but not always

Question

I have different versions of Chronoforms on two different sites, and have experienced the same problem; sometimes when someone fills in the form, the email that is sent to me has only the field names rather than the data that the user input? When I test it, I get the data just fine and can't seem to replicate the problem. And sometimes when I receive the form by email from other users, the data comes across just fine too? I'm thinking that it is something the user is doing, but because it happens so frequently, without the user knowing it, it is a big problem

Here are the sites:
http://winningwithhorsepower.org/index.php?option=com_chronocontact&Itemid=289 still running Joomla 1.5 with Chronoforms version ?

This is what I get:

New member information:
Business Name
{text_1}
Main Contact Name:
{text_0}
Phone Number
{text_2}
Email Address
{text_3}
Country
{text_5}
Street Address
{text_4}
City
{text_7}
State or Province
{text_6}
Postal Code
{text_9}
Website Address
{text_10}
Your logo (upload):
{file_24}
Short Description - this will be used on the business card page in category listings:

{text_12}
Long Description - This will be used for the main body of your landing page. If you prefer, you may upload a Word or PDF document.

{text_11}
You may use the box below to upload your profile. Please do not include images in this document. Your logo and supporting images should be uploaded separately.

{file_21}
Areas of Expertise (hold shift key down to multi-select)

{check0}
Does your location lend itself to "destination" learning? If so, please describe:

{text_14}
Upload images for your profile:

{file_15}

{file_16}

{file_18}

{file_17}

Submitted by 97.102.253.49

And on this one:
http://melhighsurf.com/contact-us running Joomla 1.7 and chronoforms version 4 release 2

I get:
Your Name {name}
Email Address {email}
Phone Number {phone}
Questions/Comments/Suggestions {comment}
File Upload {upload}

Submitted by 69.84.207.147

But I have also had successful submission?

Any ideas?

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Field names in email rather than data - but not always