what version of safari are you suing and are you using a window or mac. can you provide a link to your site, I may be able to provide the styles for you

@pathmukamar, there ara a few form styles on your theme that may affect other forms not just the image store, I sugget contacting the theme developer, in the mean time here are a few styles that can fix the issues

input[type=chekcbox] {
-webkit-appearance: checkbox;
}
input[type=text] {
-webkit-appearance: text;
}
#ims-pricelist {
text-shadow: none;
color: #666;
}
div.ims-field.ims-submit input {
height:auto;
padding: 1px 3px;
}

make sure that you add styles to your theme not the plugin, or even better use a child theme that way you can update both theme and plugin without losing your changes.