The problem appears to be that you have each product's block of Add to Cart code split across separate table cells. The block from <form...> to </form> can have a complete table inside it, or it can be inside a single table cell, but it cannot be inside a table and then subdivided across separate cells. Some examples:
This will work:
<table>
<tr>
<td>
<form action="https://www.e-junkie.com/ecom/gb.php?c=cart&i=XXXXXX&cl=44474&ejc=2" target="ejejc" method="post" accept-charset="UTF-8">
Type:
<select name="o1">
<option value="Pick Up">Pick Up</option>
<option value="Ship">Ship</option>
</select>
<input type="hidden" name="on0" value="Date">
Date:
<select name="os0">
<option value="April 1st, Townville, AZ">April 1st, Townville, AZ</option>
</select>
<input type="image" src="http://www.e-junkie.com/ej/ejadd_to_cart.gif" onclick="javascript:return EJEJC_lc(this.parentNode);" border="0" alt="Add to Cart" class="ec_ejc_thkbx">
</form>
</td>
</tr>
</table>
This will also work:
<form action="https://www.e-junkie.com/ecom/gb.php?c=cart&i=XXXXXX&cl=44474&ejc=2" target="ejejc" method="post" accept-charset="UTF-8">
<table>
<tr>
<td>
Type:
<select name="o1">
<option value="Pick Up">Pick Up</option>
<option value="Ship">Ship</option>
</select>
<input type="hidden" name="on0" value="Date">
</td>
<td>
Date:
<select name="os0">
<option value="April 1st, Townville, AZ">April 1st, Townville, AZ</option>
</select>
</td>
<td>
<input type="image" src="http://www.e-junkie.com/ej/ejadd_to_cart.gif" onclick="javascript:return EJEJC_lc(this.parentNode);" border="0" alt="Add to Cart" class="ec_ejc_thkbx">
</td>
</tr>
</table>
</form>
But this will not work:
<table>
<tr>
<td>
<form action="https://www.e-junkie.com/ecom/gb.php?c=cart&i=XXXXXX&cl=44474&ejc=2" target="ejejc" method="post" accept-charset="UTF-8">
Type:
<select name="o1">
<option value="Pick Up">Pick Up</option>
<option value="Ship">Ship</option>
</select>
</td>
<td>
<input type="hidden" name="on0" value="Date">
</td>
<td>
Date:
<select name="os0">
<option value="April 1st, Townville, AZ">April 1st, Townville, AZ</option>
</select>
</td>
<td>
<input type="image" src="http://www.e-junkie.com/ej/ejadd_to_cart.gif" onclick="javascript:return EJEJC_lc(this.parentNode);" border="0" alt="Add to Cart" class="ec_ejc_thkbx">
</form>
</td>
</tr>
</table>